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18fe0124e7
Make some minor tweaks (inlining, caching) to the formatting input path to improve integer input in a SPEC code. (None of the I/O library has been tuned yet for performance, and there are some easy optimizations for common cases.) Input integer values are now calculated with native C/C++ 128-bit integers. A benchmark that only reads about 5M lines of three integer values each speeds up from over 8 seconds to under 3 in my environment with these changeds. If this works out, the code here can be used to optimize the formatted input paths for real and character data, too. Fixes https://github.com/llvm/llvm-project/issues/134026.
37 lines
1.2 KiB
C++
37 lines
1.2 KiB
C++
//===-- lib/runtime/connection.cpp ------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "flang-rt/runtime/connection.h"
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#include "flang-rt/runtime/environment.h"
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#include "flang-rt/runtime/io-stmt.h"
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namespace Fortran::runtime::io {
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RT_OFFLOAD_API_GROUP_BEGIN
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SavedPosition::SavedPosition(IoStatementState &io) : io_{io} {
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ConnectionState &conn{io_.GetConnectionState()};
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saved_ = conn;
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conn.pinnedFrame = true;
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}
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SavedPosition::~SavedPosition() {
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if (!cancelled_) {
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ConnectionState &conn{io_.GetConnectionState()};
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while (conn.currentRecordNumber > saved_.currentRecordNumber) {
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io_.BackspaceRecord();
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}
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conn.leftTabLimit = saved_.leftTabLimit;
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conn.furthestPositionInRecord = saved_.furthestPositionInRecord;
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conn.positionInRecord = saved_.positionInRecord;
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conn.pinnedFrame = saved_.pinnedFrame;
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}
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}
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RT_OFFLOAD_API_GROUP_END
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} // namespace Fortran::runtime::io
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